
Key Takeaways from Washington’s 2025 Industrial Stormwater General Permit: What Businesses Need to Know
As of January 1, 2025, Washington State’s new Industrial Stormwater General Permit (ISGP) will take effect, marking the beginning of a new regulatory cycle that will last until December 31, 2029. This update replaces the 2020 ISGP, which expires at the end of 2024, and introduces several important changes aimed at reducing industrial stormwater pollution and protecting Washington’s waterways. For